[英]How can I make the reactionTime work in my while loop
我正在編寫一個項目來計算用戶寫答案所需的時間。 所以我會顯示一個問題,你會回答它。 之后,我將顯示您解決它所需的時間。
但是當我將變量放在我的 while 循環中時,反應時間不起作用。
這是代碼:
long startTime = System.currentTimeMillis();
long endTime = System.currentTimeMillis();
long reactionTime = endTime - startTime;
//Q1
System.out.println("Q1");
while (true) {
System.out.println("What is 1+1: ");
int ans = scanner.nextInt();
if (ans == 2) {
System.out.println("Correct");
System.out.println(reactionTime + "ms");
break;
} else {
System.out.println("incorrect please try again");
}
}
問題是你的結束時間和開始時間基本上是相等的,因為你甚至在問題被問到之前就把它們都拿走了。
要解決它,只需在用戶的答案正確時計算所花費的時間。
// take the start time once before the user gets to answer your question
long startTime = System.currentTimeMillis();
//Q1
System.out.println("Q1");
while (true) {
System.out.println("What is 1+1: ");
int ans = scanner.nextInt();
if (ans == 2) {
System.out.println("Correct");
// take the end time here, only if the answer of the user is correct
long endTime = System.currentTimeMillis();
long reactionTime = endTime - startTime;
System.out.println(reactionTime + "ms");
} else {
System.out.println("incorrect please try again");
}
}
public class Questionnaire {
public static void main(String... args) {
int totalQuestions = 10;
Scanner scan = new Scanner(System.in);
for (int i = 0; i < totalQuestions; i++) {
String title = "What is 1+1: ";
String correctAnswer = "2";
long reactionTime = askQuestionAndGetReactionTimeMs(scan, title, correctAnswer);
System.out.format("Reaction time: %dms\n\n", reactionTime);
}
}
private static long askQuestionAndGetReactionTimeMs(Scanner scan, String title, String correctAnswer) {
long beginTime = System.currentTimeMillis();
while (true) {
System.out.print(title);
String answer = scan.next();
if(correctAnswer.equals(answer))
return System.currentTimeMillis() - beginTime;
System.out.println("incorrect please try again")
}
}
}
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